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radiation
2 ENTRIES FOUND:
Learner's definition of RADIATION
[noncount]
1
: a type of dangerous and powerful energy that is produced by radioactive substances and nuclear reactions辐射
- She was exposed to high levels of radiation.她受到了高强度辐射。
2
medical : the use of controlled amounts of radiation for the treatment of diseases (such as cancer)放射疗法；辐射疗法
- He goes in for radiation next week.他下周去做放射治疗。
— called also radiation therapy, radiotherapy
3
a : energy that comes from a source in the form of waves or rays you cannot see（波或射线的）辐射能
- ultraviolet radiation紫外线辐射
b technical : the process of giving off energy in the form of waves or rays you cannot see辐射的过程
- the sun's radiation of heat太阳的热辐射
radiation
noun
ra·di·a·tion ˌrā-dē-ˈā-shən 
1
a
: the action or process of radiating
b
: the process of emitting radiant energy in the form of waves or particles
c(1)
: the combined processes of emission, transmission, and absorption of radiant energy
(2)
: the transfer of heat by radiation compare conduction, convection
Example Sentences
She was exposed to high levels of radiation. He goes in for radiation next week. the sun's radiation of heat
Recent Examples on the Web That hope had sustained them as Zach endured hours in chemotherapy infusion chairs, through rounds of radiation, and during several hospitalizations. 
S. Monica Soni, STAT, 6 Sep. 2022 The two other manikins — named Helga and Zohar — are torsos made from materials simulating the soft tissue, bones, and organs of women and designed to measure the effect of radiation on bodies in space. Catherine Garcia, The Week, 29 Aug. 2022 The batch releases from the pools may likely have higher levels of radiation. Rob Nikolewski, San Diego Union-Tribune, 26 Aug. 2022 Though uncrewed, the Artemis I mission will carry three test manikins in the Orion crew module to measure stresses and the effects of radiation during its trip to lunar orbit, returning to Earth 42 days later. Alan Taylor, The Atlantic, 24 Aug. 2022 But there is still really strong anti-nuclear sentiment: fears of radiation, fears of what would happen in an earthquake. Los Angeles Times, 19 Aug. 2022 According to some approaches to Orch OR theory, the superposition collapse mechanism underlying it should cause the spontaneous emission of a tiny amount of radiation. Robert Lea, Popular Mechanics, 16 Aug. 2022 For four decades, communities, including many Indigenous ones, have been exposed to unhealthy levels of radiation left over from uranium ore extraction and refining efforts that have long since ceased. Ellen Mcgirt, Fortune, 12 Aug. 2022 Its radioactive particles decay in the lungs, releasing small bursts of radiation. Maya Miller, ProPublica, 8 Aug. 2022 See More
S. Monica Soni, STAT, 6 Sep. 2022 The two other manikins — named Helga and Zohar — are torsos made from materials simulating the soft tissue, bones, and organs of women and designed to measure the effect of radiation on bodies in space. Catherine Garcia, The Week, 29 Aug. 2022 The batch releases from the pools may likely have higher levels of radiation. Rob Nikolewski, San Diego Union-Tribune, 26 Aug. 2022 Though uncrewed, the Artemis I mission will carry three test manikins in the Orion crew module to measure stresses and the effects of radiation during its trip to lunar orbit, returning to Earth 42 days later. Alan Taylor, The Atlantic, 24 Aug. 2022 But there is still really strong anti-nuclear sentiment: fears of radiation, fears of what would happen in an earthquake. Los Angeles Times, 19 Aug. 2022 According to some approaches to Orch OR theory, the superposition collapse mechanism underlying it should cause the spontaneous emission of a tiny amount of radiation. Robert Lea, Popular Mechanics, 16 Aug. 2022 For four decades, communities, including many Indigenous ones, have been exposed to unhealthy levels of radiation left over from uranium ore extraction and refining efforts that have long since ceased. Ellen Mcgirt, Fortune, 12 Aug. 2022 Its radioactive particles decay in the lungs, releasing small bursts of radiation. Maya Miller, ProPublica, 8 Aug. 2022 See More Word History
First Known Use
15th century, in the meaning defined at sense 1a
Time Traveler
The first known use of radiation was in the 15th century Phrases Containing radiation
noun
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